Problems with reading the series bytes

Hello

I currently have a PIC18F microcontroller serial communication with LABview using the base read and write.vi series. The PEAK sends strings such as "V222! (V is the character of the header, and! being the end character). Then, I have a program to take each individual character read and concatenate them in a larger string for data extraction. The port has been configured to 38400 baud and be only a single byte of long.

The captain sends this one byte at the time and the problem here is that LABview seems to be only reading V most of the time, and occasinally has 2. Since it doesn't seem to be never read the end character, the sequence of extracting data from my code is never executed.

A few questions I have are:

The captain may send one byte at a time, but also all other devices communicate through a serial port.  The definition of the serial port involves both a byte.  Actually it's really a LITTLE at a time.  But serial port parameters leads to the gathering of 7 or 8 bits to produce a byte.  The PEAK sends a follow-up byte to another byte, etc.  The time between shipments of the byte may be too small to read contiguously in your Labview program.

At very slow speeds, it could really work.  At 300 baud (3mS / bit), there are 33 mS to send a byte (8-bit + stop bit, start bit).  So if your loop runs fast enough, you get every byte one at a time.  But there is the overhead of other code to store the bytes, etc..

38000 baud to only 0.2 mS to send a byte.  LabVIEW is not fast enough to loop at this rate to capture all the bytes individually.

But why bother?  Simply capture all the bytes and treat them as a complete message.

Tags: NI Software

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